diff --git a/src/lang/english.txt b/src/lang/english.txt
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -3504,6 +3504,7 @@ STR_MEASURE_AREA_HEIGHTDIFF             
 STR_DATE_TINY                                                   :{RAW_STRING}-{RAW_STRING}-{NUM}
 STR_DATE_SHORT                                                  :{STRING} {NUM}
 STR_DATE_LONG                                                   :{STRING} {STRING} {NUM}
+STR_DATE_ISO                                                    :{2:NUM}-{1:RAW_STRING}-{0:RAW_STRING}
 
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